No.1473
Georgy Evseev & Boris Shorokhov
(Russia)

Original Fairy problems
JF-2020/I:
January – June’2020


Definition: (click to show/hide)


No.1473 Georgy Evseev &
Boris Shorokhov

Russia

original – 11.01.2020

Solution: (click to show/hide)

white Ka5 Sf4 Pc6b5c5f5b4 LIg6a2  black Ke3 Qg1 Rd4h1 Bc4c3 Sa8f1 Pc7d5e5b3d3f2h2 LIe4b2g2

h#2.5         3 solutions            (9+18)
Lions a2, g6


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seetharaman
seetharaman
8 months ago

Nice idea of double sacrifice Zilahi! Vaguely remember seeing something on these lines, but perhaps it was only double sac., and not Zilahi.

shankar ram
shankar ram
8 months ago

The 8th Commend problem by Mikhail Khramtsevich from here:
http://www.kobulchess.com/en/tournaments/awards/1282-kobulchess-helpates-2-2016-award.html
shows cyclic Zilahi with 4 passive and 2 active sacrifices.

Georgy Evseev
Georgy Evseev
8 months ago
Reply to  shankar ram

There is a small number of twomovers with extended cyclic Zilahi, but there is not enough moves for two active sacrifices.

There is also a number of threemovers with 2+2 Zilahi with active sacrifices (two pieces are captured and remaining two participate in mate) and even a third (non-active) capture is added sometimes.

There is also the following problem:

Alexandre PANKRATIEV, Orbit 2003
White : Kf2 Rd8 Bg8a1 Sc3 Pg6e3
Black : Kf5 Qb8 Re7h5 Bf6b5 Sc5 Pg7e6e5c4e4d3d2

h‡2,5

b) Sc3>c6; c) Bg8>a2

with two active sacrifices in three solutions, but the twinning is evil and Zilahi effect is not uniform as four white pieces are used.

Manfred
Manfred
8 months ago

In my neutral cycle only half of the sacrifices are active, but it might still be interesting in this context.

[img]file:///C:/MRi/Schach/Aufgaben/Archiv/Final/487%20Neutraler%20Zilahizyklus/487 (engl.).png[/img]

Manfred
Manfred
8 months ago
Reply to  Manfred

Thought it will be uploaded.
Here it is in text:
Manfred Rittirsch
feenschach 1997
White : Kf2
Black : Kh1 Bh7 Sf8 Pe7b5f5a4d4a3b2h2
Neutral : Rc8 Bf1 Pc6
Forsyth: 2*R2n2/4p2b/2*P5/1p3p2/p2p4/p7/1p3K1p/5*B1k
h#3 (1+11+3) C+
3.1…

1.nBc4 nBe6 2.nBxc8 nBb7 3.Sd7 nBxc6#
1.nRxc6 nRc1 2.nRa1 nBd3+ 3.nBb1 nRxb1#
1.b4 nBa6 2.nBb7 cxb7 3.nRa8 bxa8=nB#

Georgy Evseev
Georgy Evseev
8 months ago
Reply to  Manfred

Neutral pieces change logic of play.

The following collective problem has quiet active sacrifices. WinChloe did not consider battery mates as Zilahi, though.

Georgy EVSEEV & Lev GROLMAN
17° T.T. Chess Composition Microweb 2005, 1° Prix
White : Kh3 Pd2 LIh2
Black : Ke1 Qh1 Rg6g1 Bf8f1 Sh8 Pc7e7b5e4g2 LIb8g8f4
Neutral : Bf6c2 Pd4 Nd5 LIb6

h‡3 (3+15+5) C+
b) nPd4>e3
c) nPd4>h6
Nightrider, Lion

a) 1.Nnc3 LInb4 2.dxc3 Fnd4 3.Tb6 cxd4‡
b) 1.LInf2 Fnh4 2.exf2 Nne3 3.LIg5 fxe3‡
c) 1.Fng5 Nnh7 2.hxg5 LInbh6 3.Tf6 gxh6‡

Kjell Widlert
Kjell Widlert
8 months ago
Reply to  Georgy Evseev

Of course this is a Zilahi (of the fully cyclic active 2-captures type): it is always the last of the three thematic pieces that gives mate – it does not perform the mating move, but that is secondary.
A wonderful problem, by the way! It shows that fairies make it possible to show familiar themes in novel and fresh ways, in this case with the Zilahi sacrifices motivated by the need to perform a capturing nP switchback.

Kjell Widlert
Kjell Widlert
8 months ago

Clearly at least three White moves are needed for an “active 2-captures Zilahi”: two sacrifices + one mate. Also we need three solutions for a fully cyclic form. I would have thought this existed already, considering how many Zilahis there are, but that must be an illusion. The position of 1473 (with those composer names!) seems to indicate that the theme is quite hard.